From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2010-07-30T21:47:30+09:00
Subject: Re: my script just read one line?

On Fri, Jul 30, 2010 at 2:18 PM, Junhui Liao <junhui.liao@uclouvain.be> wrote:
>
>
>
>> File.open("../original_data/test_2lines.tsv") do |file|
>>   first_line = file.readline
>>   first_line_times = first_line.chomp.split("\t").each_slice(2).map
>> {|time,signal| time}
>>   write_line_to_file first_line
>>   file.each_line do |record|
>>     line_data = record.chomp.split("\t")
>>       write_line_to_file line_data, first_line_times
>>   end
>> end
>>
>> def write_line_to_file line, base_time = Hash.new(0)
>>   line_data.each_slice(2).with_index do |(time,signal), index|
>>     File.open("#{index}_debug_split"+".tsv" , "w") do |f|
>>       f << "#{time.to_i - base_time[index]}\t#{signal}\n"
>>     end
>>   end
>> end
>>
>> Hope this gives you an idea to explore,
>>
>> Jesus.
>
>
> Dear Jesús Gabriel y Galán,
>
> Thanks a lot for your second comment.
>
> While to the following script, there are few problems
> while running.
>
> 1, To this line " write_line_to_file first_line" and
> this line "write_line_to_file line_data, first_line_times ",
> the error message like following,
>
> in `block (2 levels) in <class:File_spliter>': undefined method
> `write_line_to_file' for File_spliter:Class (NoMethodError)
>
> It seemed the "write_line_to_file" has no definition before calling.
> I tried to make a class to "surround" your code, but same error
> occurred.

Sorry, the method write_line_to_file should be defined before the
other block of code, so that it exists when it's called.

>
>
> 2, I don't understand this two lines.
> 2.1, "write_line_to_file first_line". Since the definition of
> write_line_to_file has
> two arguments, while here just only one, and I don't know the purpose of
> this
> line.

It has two arguments, but the second is optional, and if not passed,
it will be assigned a new Hash(0).
See the def of the method.

>
> 2.2, "line_data.each_slice(2).with_index do |(time,signal), index|".
> Why is not "line.each_slice(2).with_index do |(time,signal), index|" ?

It's a mistake on my part. Copy/paste error.

Jesus.